Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income (loss)	$ 25,226	$ 27,015	$ (29,628)
Adjustments to reconcile net income (loss) to net cash and cash equivalents provided by operating activities:
Amortization of intangibles and other	2,113	2,069	1,895
Amortization of convertible note discount and issuance costs	1,129	0	0
Depreciation	4,210	3,706	6,751
Foreign currency exchange (gain) loss	(846)	255	937
Net (gain) loss on sale of marketable securities	(1)	0	1
Share-based compensation	4,802	5,439	3,759
Provision for (recovery of) doubtful accounts and inventory valuation	1,278	(1,188)	4,775
Deferred income taxes	(9,018)	(152)	(217)
Accounts receivable	17,958	(23,428)	(12,956)
Income taxes receivable	(529)	2,300	969
Inventories	(35)	(5,577)	6,922
Prepaid expenses and other assets	(4,389)	(113)	352
Accounts payable	(3,427)	2,183	3,232
Accrued liabilities	1,083	2,671	(1,227)
Deferred revenue	(1,330)	948	1,619
Other current liabilities	5,720	802	(1,252)
Non-current liabilities	1,500	(608)	2,009
Net cash and cash equivalents provided by (used in) operating activities	45,444	16,322	(12,059)
Cash flows from investing activities:
Purchases of marketable securities	(81,004)	(7,823)	(12,161)
Proceeds from sales of marketable securities	11,418	10,261	19,446
Purchases of property, plant and equipment	(1,622)	(4,363)	(587)
Purchase of business, net of cash acquired	0	(849)	(5,011)
Net cash and cash equivalents provided by (used in) investing activities	(71,208)	(2,774)	1,687
Cash flows from financing activities:
Net proceeds from issuance of convertible senior notes	57,749	0	0
Proceeds from sale of warrant	7,007	0	0
Purchase of convertible note hedge	(14,507)	0	0
Issuance of shares through share-based compensation plans	257	289	217
Tax benefit for sale of shares through share-based compensation plans	528	242	0
Net cash and cash equivalents provided by financing activities	51,034	531	217
Effect of exchange rate changes on cash and cash equivalents	281	(798)	259
Net increase (decrease) in cash and cash equivalents	25,551	13,281	(9,896)
Cash and cash equivalents at beginning of year	71,120	57,839	67,735
Cash and Cash Equivalents, at end of year	96,671	71,120	57,839
Income taxes paid (received)	$ 2,454	$ 916	$ (3,062)